Typewriting machine



Oct. 11, 1932. c. GABRIELSON ET AL TYPEWRITING MACHINE Filed Aug. 30,1929 2 Sheets-Sheet 1 ATTORNEYS Oct. 1l, 1932. c. GABRIELSON T AL1,881,462

TYPEWRITING MACHINE 2 Sheets-Smet 2 Filed Aug. 30. 1929 Y I N V E NTO R5garabriclfan/ v" MN in@ m x u m6 Zar Wazgj ATTO R N EYS i B1 to providean improved paper bail device for Patented Oct. 11, 1932 naires s CARLGABRIELSON AND CHARLES W'AUCQUEZ, 0F SYRACUSE, N'EW YORK, ASSIGNORS T LC SI'TH z, CGRONA. TYPEWRITERS INC., OF SYRACUSE, NEW YORK, A COR-FGRATON 0F NEW YORK TYPEWRITING LACHINE Application filed August 30,1929. Serial No. 389,413.

This invention relates to improvements in typewriting machines, and moreparticularly to paper feeding mechanism for such machines.

rlhe principal objects of the invention are typewriting machines; toprovide a simple and durable paper bail mechanism embodying provisionsfor yieldably pressing the lbail against the platen in its on position,and for holding the bail in a plurality of off positions; to provide abail and spring-urged controlling means thereof arranged to eitheryieldably press the bail to the platen, yieldably latch the bail in afull olf position ad- `iacent the paper shelf, or frictionally hold thebail in any intermediate or7 position upon swinging of the bail aboutits pivotal axis; and to provide means for either press- 0 ing the bailtoward the platen or holding the same in various off positions, whichmeans consists of few parts of simple and inexpensive construction.

To the above and other ends which will appear from the followingdescription of the preferred embodiment of the invention illustrated inthe accompanyingl drawings, the invention comprises the combinationsofdevices, features of construction, and arrangements of partsparticularly pointed out in the claims.

In the drawings, which illustrate the preferred form of the invention asapplied to an L C Smith typewriting machine,

Fig. 1 is a fragmentary top plan view, showing the bail in normal activeor on position; f

TJig. 2 a front view showing the parts of the bail mechanism positionedas in Fig. 1;

Fig. 3 a fragmentary side view, looking from the right hand side of themachine, showing the bail in on position;

Fig. l a view similar to Fig. 3, showing the 'bail frictionally held inan intermediate off position;

Fig. 5 a side view, looking from the left hand side of the machine,showing the bail yieldably latched in its full off position; 6 an edgeview of one of the pair of bail controlling members; and

b Fig. 7 a side view of said controlling mem- The traveling platencarriage comprises side bars 10 and a rear cross-bar 11, and runs onsuitable ball bearings 13 in raceways on the stationary framework 12 ofthe machine. The platen lll has its shaft 15 journalled in Asuitablebearings in the side bars 10. The paper is supported and guided to theplaten at the rear of the platen by the usual pape-r shelf 16 mounted onthe carriage, and is fed and guided forward under the platen by theusual paper feed devices on the carriage comprising the paper table 17and feed rolle-rs 18. The type on the' heads vof the type bars 19 strikeon the front portion of the platen, as usual in the L C Smith machineshown, and as indicated in Fig. 3. The improved'paper bail mechanism maynow be described.

The paper bail comprise-s a pair of sheet metal side bars or arms 20 anda metal crossbar -in the form of a .rod 21, the ends of said rod beingrigidly secured by pins 23 in tubular sleeves or bosses y22 rigidly heldin the free ends. of side arms 2O and extending horizontally inward fromthe side arms, said bosses having reduced outer portions 24 swaged inlholes in the forward ends of the side arms. Instead of having thecross-bar of the bail directly Contact the platen, or the paper aboutthe platen, preferably a pair of short feed rollers 82 are provided forcontacting the paper, said rollers being journalled on sleeve bearings33 frictionally held on the crossbar.

A. pair of sheet metal brackets are rigidly secured tothe rear cross bar11 of the carriage for mounting the bail .and its controlling devices.These brackets have body portions 25 bent to a right angle between theirends above cross-bar 11, the pendent parte of which lie in a verticalplane extending transveresly of the machine and are formed at theirlower ends with integral inwardly extending attachment arms 26, each ofsaid arms 26 being fastened by two screws 34 to a pair of bosses 27 onthe front face of crossbar 11, there being a. pair of bosses 27 adjacenteach end of the cross-bar. The upper sections of the body portions ofthe brackets extend rearwardly and lie latwise in a horizontal plane,the angular body portions ot these brackets being located to the rearoit and below the upwardly and rearwardly extending paper shelf 16.

` The rearwardly extending parts of the brackets have formed integrallytherewith at their outer et ges, as more clearly shown at 29 in Figs. land 2, bail mechanism supporting arms 28 bent upwardly to lie inparallel vertical planes extending fore and ait of the machine, saidsupporting arms and pendent extensions 30 thereof preferably abuttingouter edge portions of the horizontal and vertical parts of the mainangular bodies 25 of thebrackets, as shown, to stiften the bailmechanism supporting structure.

The rear ends of the side arms 2() ot the bail lie against the outerfaces of supporting arms 28 of the brackets at the forward ends of saidVarms 28 and are pivotally held to arms 28 at these points by shoulderedpivot screws 8lv for swinging oi the bail upwardly and rearwardly aboutan axis parallel with the axis of the platen and located .slightly aboveand to the rear of the platen, from an on or active position in whichthe feed rolls 82 contact the platen, or paper thereabout, at points onthe upper front portion of the platen in a linev clear ot the type barheads in printing position, to a full oil position in which thecross-bar and rolls lie close to the front tace of the upper end of thepaper sheltlbut spaced from the shelf sufficiently for. free passagetherebetween of both the leading and following portions oi' a pluralityof superposed work sheets in the machine.

The paper bail is adapted to be swung about its pivotal axis by theoperator ing the same with the lingers, and is held on or OE, dependentupon the positionto which it is so moved, automatically by a pair ofspring urged pivoted controllers mounted on the pair of sheet metalbrackets 25. Each controller comprises a dat sheet metal swings ing arm85 extending fore and ait and disposed tlatwise in a vertical planelocated slightly outside the plane of the adjacent arm 28 of the bracket25 to which it is pivoted. Arms are each provided vwith an inwardlyextending sleeve bearing or hub 86, the outer end of which is swaged inan opening lin therear end of the arm, and a shouldered pivot screw 37extends inwardly through the hub and is threaded through the adjacentbracket arm 28 with thevinner end of the controller arm hub abutting theouter face of bracket arm 28. Screws 37 pass through arms 28 at a pointslightly above the level of the rearwardly extending parts of brackets25 and the pivotal axis oit the bail, and about mid-length ot arms 28,and lock nuts 38` are preferably screwed on the inner -inward from lthecontroller arm at a point above the pivot of said arm, and stud 4lprojects outwardly from bracket arm 28 at a point below and to the rearot the controller arm pivot, spring 89 being wound about the hub in adirection to exert a constant yielding pressure on the controller armurging the arm downward Side arms 2O of the bail carry outwardlyprojecting studs 42, preferably having metallic anti-friction rollers 48j ournall-ed thereon, the stud 42 on each side arm being located a shortdistance from the bail axisl and between said axis and the bailcross-bar. The controller arms are provided with identical longitudinalcani slots 44 through which said studs A42 with their rollers 43project. Slots 44 are arcuate slots each having a relatively longintermediate dwell edge portion 45 and two short camming edge portions46 and 47 at opposite ends ot the slot along the top wall of the slot,said slot being somewhat wider than the diameter of the roller engagedtherein so that the roller will notcontact the bottoni wall of the slotwhile the top wall of the slot is held constantly pressed against theroller by spring 39.

Dwell edge portions 45, when engagedV by the rollers on the bail sid-earms, extend in an arc corresponding with the path of swinging movementof the rollers with the bail, i. e. in an arc struck from the pivotalvaxis of the bail as a center. Camming edge Vportions 46 and 47 areeccentric to the bail axis in all positions of the bail, curving fromopposite ends of the dwell edge portion toward the upper edge of the armand being located, respectively, torward and rearward ot the verticalplane ot the bail axis.

f It will be obvious fromthe Joregoing description, that when the bailis swung rearward until the rollers engage cam edge portions 47 of thecontrollers, the bail will be cammed rearward by the controllers untilthe rollers engage the rear ends of slots 44 and then arrested, as shownin F ig. 5, the length of the slots being such that the rearwardswinging of the bail is arrested by the controllers with the cross-barand feed rollers 32 slightly forward of the upper end of the paper shelf16. It will also be observed that the controllers, in this full oit7position oi the bail, act as spring latches to yieldably ,latch the bailin said position so as to require upward swinging of the controllersagainst the resistance oi' the springs 89 to dis lodge the bail fromsaid position. Cam porica lll)

tion 47 is preferably made quite short, 'as shown, so as to be only longenough for cam portieri to hook securely over the roller with the rollercontacting the rear end of the slot.

When the' rollers are engaged with the long dwell portions 45 at anypoint along said portions, the spring pressure is exerted on the bail ina radial plane passing through the rollers 43 and the pivotal axis ofthe bail, so that the springs 39 and the controllers rocked therebycannot exert a bail swinging thrust on the bail, and so that thepressure on the rollers will enable the controllers to frictionally holdthe bail in whatever intermediate off position it may be moved to, forexample the position shown in Fig. 4.

l/Vhen the bail is swung forward and downward from off position untilthe rollers engage cam portions 46, the controllers will cam the bail'forward and downward until the fe-ed rollers 32 on the bail cross-barcontact the platen, or the paper passing upwardly thereover, and willyieldably hold the rollers 32 in on position. Slots 44 are of suchlength that rollers 32 contact the platen before rollers 43 on the bailside arms can reach the forward endsv of the slots. Cam portions 46 aresufiiciently long to permit rollers 43 to ride slightly back and forththerealong to permit the bail to yield to compensate for varying numbersand thicknesses of paper sheets and inequalities in the paper sheets orplaten surface without throwing the bail-side arm rollers on to thedwell portions 45 of the controller cam slots. It will thus be observedthat the controllers act as yielding latches to yieldably hold the bailin on or :active position.

`What we claim is:

l. ln a front strike typewriting machine, the combination of a papercarriage, a platen on the carriage, a paper bail having rearwardlyextending side arms pivotally held to the carriage for swinging of thebail about an axis in rear of the vertical plane of the platen, a pairof fore and aft extending controller arms pivotally held at their rearvends to the carriage to swing about an axis parallel with the bail axis,a pair of springs connected with the carriage and said arms to urge thearms downwardly, said arms each having a cam edge having two activeportions and an intermediate dwell portion, and laterally projectingmeans carried by the bail side arms and engaged under the cam edges ofsaid cont-roller arms, the two active portions of each cam edge beingarranged to swing the bail in opposite direct-ions, and the dwellportions of the cam edges being curved so as to lie in an arc conformingwith the path of movement of the laterally projecting means when engagedtherewith.

2. In a front strike typewriting machine having a paper carriage, aplaten journalled on the carriage, and a paper shelf extending upwardand rearward from behind the platen, the combination of a paper bailhaving a cross-bar overlying the platen in the on position of the bailand side arms extending rearwardly from said cross-bar and pivotallvheld to the carriage above and to the rear ofthe platen, a pair of foreand aft extending controller arms pivotally held to the carriage inrea-r of the bail axis at their rear ends to rock up and down, springsconnected with the carriage and controller arms ,for rocking the armsdownward, said arms having longitudinal slots, the top edges of whichhave cam portions at their ends andan intermediate dwell portion, andmeans projecting laterally from said bail side arms between their pivotsand the cross-bar and rockable with said, arms and engaged under the topedges of the slots, the cam edge portions at the forward ends of theslots being disposed vto thrust said laterally projecting means towardthe platen while the cam edge portions at the rear ends of the slots areadapted to thrust said means away from the platen against the rear endwalls of the slots to a position in which the bail cross-bar lies spacedslightly forward of the upper end of the paper shelf.

8. In a typewriting machine, the combination of a carriage, a platen onthe carriage, a paper bail pivotally held to the carriage, and a pivotedpressure member on the carriage constantly urged in one direction andconstantly bearing against a part of the bail, to exert pressure on saidpart in a straight line passing through the bail axis and the point ofcontact throughout a part of the throw of the bail to variably hold .thebail ycrossbar out of paper controlling relation with theplaten, and toexert pressure on said part in a direction to carry the bail cross-barinto and yieldably maintain it in paper controlling` relation with theplaten, said member having a portion arranged for engagement by saidpart of the bail to positively limit swinging movement ofthe bail in thedirection carrying the bail cross-bar away from the platen. l p

4. In a typewriting machine, the combination of a paper carriage, arotatable platen on the carriage, a paper holding bail having side armspivotally held lto the carriage to swing about a fixed axis parallelwith the platen axis, an arm for controlling swinging of the bail aboutsaid axis between anextreme inactive position and paper holdingposition, said arm being pivotally held to the carriage to swing about afixed axis different from but parallel with the bail axis, a springconstantly urging said arm inv one and the same direction around itsaxis in all positions of they bail, one side arm of saidbail beingprovided with a lateral project-ion, and p said bail controlling armhaving a contact surface along which said projectiontravels "ioo fiiosduring swinging movements of the bail, said point of contact of thepin'with the dwell edge contact surface comprising an intermediateportion.

arcuate portion which exerts pressure on said j In testimony whereof wehereunto affix our projection in a line passing through the bailsignatures.

I cuate portion, one of which terminal portions'exerts pressure on saidprojection in a direction to urge the bail to the platen Ithroughout oneend portion of the bail throw, and the other of which terminal portionsexerts pressure on said projection in a direction to urge the bail awayfrom the platen throughout the opposite end portion of the bail throw. f

ln a typewriting machine, the combination ofa platen carriage, arotatable platen on thev carriage, a paper holding bail coactive withthe platen to hold paper thereto and having side arms pivotally held tothe carriage to swing about a lixed axis parallel with the platen amisfor movement or" the bail out of active position, a spring urgedcontroller arm pivotally held to the carriage to swing about a fixedaxis parallel with the bail axis and constantly spring urged in one andthe same direction about its axis, said controller arm having a cam edgeconstantly pressing on the hail at a fixed point on the bail andcomprising a dwell portion :tor exerting .thrust on the bail in a linepassing through the bail axis and an active portion at one end of saiddwell portion for exerting thrust on the bail in a line passing to oneside of the'bail axis and in a direction to urge the bail to the platen.

ln a typewriting machine, the combination of a platen carriage, arotatable platen on the carriage, a paper holding bail having side arms'pivotally held to the carriage to swing about a xed axis into and outof paper holding relation with the platen, a bail con trolling armpivotally held to the platen carriage to swing about a fixed axisdifferent from but parallel with the bail axis and havl ing a directpin* and slot connection at one sid-e `of its pivotal axis with one sidearm ot' the bail, and a spring constantly urging said controlling arm inone `and the same direc- \tion around its axis, said slot having alongitudinal cam edge with two active end portions connected by a dwellportion, one of which end portions iscoactive with said pin to swing thebail toward the platen and the other ot' which is coactive with said pinto swing the bail away from the platen until the lpin is engaged withthe adjacent end or the env sure from said spring to the bail constantlyin a line passing through the bail axis and the CARL GABRIELSON. CHARLESWAUCQUEZ.

